Abstract
In this work, the magnetization response of FeMnAlNi superelastic shape memory alloys (SMAs) is investigated under stress. Wires with a diameter of 0.5 mm were subjected to repeated abnormal grain growth heat treatments in order to obtain bamboo structured oligocrystalline grains that are necessary for superelasticity. Solution heat treated wires were aged at 200ºC for 3 h to strengthen the austenite matrix. Tensile cyclic tests were performed at room temperature until failure, while the magnetization response of the wires was monitored using a hall sensor during loading and unloading in each cycle. It is observed that after each cycle, overall magnetization of the alloy decreases once the irrecoverable strain is introduced after large deformations and magnetization of the sample is inversely correlated with the irrecoverable strain. The findings of this work show that the magnetic shift in Fe-SMAs under deformation can be used a health monitoring tool in next generation structures to detect large deformations and cracks.
Highlights
Superelastic materials are a class of shape memory alloys (SMAs) that can generate large recoverable deformations upon the application of stress [1, 2]
Irrecoverable strain reaches a maximum value of 2% in the 8% strain level
Stress drops are observed during forward transformation, which is a typical response of Fe-Mn-Al-Ni wires having oligocrystalline grains [11, 15]
Summary
Superelastic materials are a class of shape memory alloys (SMAs) that can generate large recoverable deformations upon the application of stress [1, 2]. This property has been shown to limit the damages in structures caused by adverse events such as earthquakes and hurricanes [3,4,5]. Fe-SMAs are inexpensive alternatives to NiTi SMAs and they can be processed They show an interesting magnetization change during phase transformation from austenite to martensite under stress. The combination of these properties can be used to create a new health monitoring framework in generation structures where embedded Fe-SMAs can serve as a load bearing and a sensing element at the same time
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
